The OVNS JC01 Pod kit is an awesome little refillable pod system.
The square shape of the battery section makes this device very portable and discrete. The internal battery the JC01 uses is 400mAh, usually enough to last someone about a day with normal usage. There are 4 LEDs, a blue LED which indicates if the device is working, and 3 white LEDs displays battery life.
The refillable pods have a 0.7mL capacity and use a ceramic coil. Flavor of the pods are very good.
Both the battery section and pods are compatible with Juul products.
Note: It is worth mentioning that the JC01 does not have a temperature control mechanism, so if you are using Juul pods on a JC01 be careful to not take long puffs.